import java.util.Scanner;

public class test1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String arr = scanner.nextLine();
        char tmp = 'a';
        for(int i = 0; i < arr.length(); i ++) {
            if(arr.charAt(i) == 'a' || arr.charAt(i) == 'e' || arr.charAt(i) == 'i' ||arr.charAt(i) == 'o'||arr.charAt(i) == 'u') {
                tmp = arr.charAt(i);
            }
        }
        System.out.print(tmp);
    }
}
